I went ahead and beat Chuck while I was there, because I knew I would have to come back, and I didn't want to have to Surf all the way back there. Chuck was easy with Shaman and Froggy. Then, I got Fly, climbed the Lighthouse, and went BACK to Cianwood, got the SecretPotion, went BACK to the Lighthouse, then went and fought Jasmine. She was moderately difficult, and I lost to her a couple of times because of those Magnemites and Froggy. But, I beat her eventually. I went to Mahogany Town, then realized I had to go to the Lake of Rage. I used the whole Rocket sidequest thing as an excuse for my grinding of my lower tier, which were Scimmy, Fortress, and Derp. I then fought Pryce. I tried to use Ty's Rock Slide to win the day, but in the end it was Froggy who beat the majority of Pryce's team. I then used the Radio Tower sidequest to grind my lower tier up again. I went on to Clair, whose Gym was pretty hard because I had no coverage for Dragons. I taught Froggy Icy Wind, but it didn't do too much. I ended up evolving Ty and using Rock Slide/Earthquake to kill the Dratinis/Dragonairs in the Gym, and Froggy to beat the Horsea family. I then went to Dragon's Den because Clair said I HAD to do it if I wanted the badge. I went back to New Bark, got the Master Ball, which I knew I wouldn't use, and went off to Kanto. I got there, and had a pretty rough time because half my team was under Lv. 30. In the end, I had a team of Lv. 30s that weren't all that ready for the E4. That's what I'm doing right now, training for the E4.

Team:

Spoiler:

Ty Lv. 33
Moves:
Bite
Rock Slide
Thrash
Earthquake

Fortress Lv. 35
Moves:
Rapid Spin
Rollout
Selfdestruct
Take Down

Derp Lv. 31
Moves:
Counter
Mirror Coat
Safeguard
Destiny Bond

Scimmy Lv. 35
Moves:
Iron Tail
Slash
Swift
Poison Sting

Shaman Lv. 31
Moves:
Peck
Fly
Night Shade
Swift

Froggy Lv. 40
Moves:
Surf
Whirlpool
Strength
Waterfall

If you can help me by telling me how I can grind this team for the E4, preferably at least Lv. 55, please do. I would appreciate any help. Bye!

Sadly, Johto is a notoriously bad place to grind in. At that point pretty much just the route before Victory road or Victory Road itself are your best options. Also, if you've collected any phone numbers, you should spam them for rematches.